ProSoft Technology MVI46-103M - Manual (Page 41)

Ladder Logic MVI46-103M ♦ SLC Platform
IEC 60870-5-103 Master Communication Module
ProSoft Technology, Inc. Page 41 of 187
September 12, 2006
5 Ladder Logic
In This Chapter
Main Routine.......................................................................... 41
Data Transfer (U:3) ................................................................ 42
Control Routine (U:4) ............................................................. 43
Ladder logic is required for application of the MVI46-103M module. Tasks that
must be handled by the ladder logic are data transfer, special block handling and
status data receipt. This section discusses each aspect of the ladder logic as
required by the module. Additionally, a power-up handler should be written to
handle the initialization of the module's data and to clear any processor fault
conditions.
5.1 Main Routine
The main routine is used to call the data transfer and control subroutines. An
example of the main routine is shown in the following two rungs: